This source file includes following definitions.
- lb035q02_write
- lb035q02_init
- lb035q02_disable
- lb035q02_enable
- lb035q02_get_modes
- lb035q02_probe
- lb035q02_remove
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15 #include <linux/gpio/consumer.h>
16 #include <linux/module.h>
17 #include <linux/spi/spi.h>
18
19 #include <drm/drm_connector.h>
20 #include <drm/drm_modes.h>
21 #include <drm/drm_panel.h>
22
23 struct lb035q02_device {
24 struct drm_panel panel;
25
26 struct spi_device *spi;
27 struct gpio_desc *enable_gpio;
28 };
29
30 #define to_lb035q02_device(p) container_of(p, struct lb035q02_device, panel)
31
32 static int lb035q02_write(struct lb035q02_device *lcd, u16 reg, u16 val)
33 {
34 struct spi_message msg;
35 struct spi_transfer index_xfer = {
36 .len = 3,
37 .cs_change = 1,
38 };
39 struct spi_transfer value_xfer = {
40 .len = 3,
41 };
42 u8 buffer[16];
43
44 spi_message_init(&msg);
45
46
47 buffer[0] = 0x70;
48 buffer[1] = 0x00;
49 buffer[2] = reg & 0x7f;
50 index_xfer.tx_buf = buffer;
51 spi_message_add_tail(&index_xfer, &msg);
52
53
54 buffer[4] = 0x72;
55 buffer[5] = val >> 8;
56 buffer[6] = val;
57 value_xfer.tx_buf = buffer + 4;
58 spi_message_add_tail(&value_xfer, &msg);
59
60 return spi_sync(lcd->spi, &msg);
61 }
62
63 static int lb035q02_init(struct lb035q02_device *lcd)
64 {
65
66 static const struct {
67 u16 index;
68 u16 value;
69 } init_data[] = {
70 { 0x01, 0x6300 },
71 { 0x02, 0x0200 },
72 { 0x03, 0x0177 },
73 { 0x04, 0x04c7 },
74 { 0x05, 0xffc0 },
75 { 0x06, 0xe806 },
76 { 0x0a, 0x4008 },
77 { 0x0b, 0x0000 },
78 { 0x0d, 0x0030 },
79 { 0x0e, 0x2800 },
80 { 0x0f, 0x0000 },
81 { 0x16, 0x9f80 },
82 { 0x17, 0x0a0f },
83 { 0x1e, 0x00c1 },
84 { 0x30, 0x0300 },
85 { 0x31, 0x0007 },
86 { 0x32, 0x0000 },
87 { 0x33, 0x0000 },
88 { 0x34, 0x0707 },
89 { 0x35, 0x0004 },
90 { 0x36, 0x0302 },
91 { 0x37, 0x0202 },
92 { 0x3a, 0x0a0d },
93 { 0x3b, 0x0806 },
94 };
95
96 unsigned int i;
97 int ret;
98
99 for (i = 0; i < ARRAY_SIZE(init_data); ++i) {
100 ret = lb035q02_write(lcd, init_data[i].index,
101 init_data[i].value);
102 if (ret < 0)
103 return ret;
104 }
105
106 return 0;
107 }
108
109 static int lb035q02_disable(struct drm_panel *panel)
110 {
111 struct lb035q02_device *lcd = to_lb035q02_device(panel);
112
113 gpiod_set_value_cansleep(lcd->enable_gpio, 0);
114
115 return 0;
116 }
117
118 static int lb035q02_enable(struct drm_panel *panel)
119 {
120 struct lb035q02_device *lcd = to_lb035q02_device(panel);
121
122 gpiod_set_value_cansleep(lcd->enable_gpio, 1);
123
124 return 0;
125 }
126
127 static const struct drm_display_mode lb035q02_mode = {
128 .clock = 6500,
129 .hdisplay = 320,
130 .hsync_start = 320 + 20,
131 .hsync_end = 320 + 20 + 2,
132 .htotal = 320 + 20 + 2 + 68,
133 .vdisplay = 240,
134 .vsync_start = 240 + 4,
135 .vsync_end = 240 + 4 + 2,
136 .vtotal = 240 + 4 + 2 + 18,
137 .vrefresh = 60,
138 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
139 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
140 .width_mm = 70,
141 .height_mm = 53,
142 };
143
144 static int lb035q02_get_modes(struct drm_panel *panel)
145 {
146 struct drm_connector *connector = panel->connector;
147 struct drm_display_mode *mode;
148
149 mode = drm_mode_duplicate(panel->drm, &lb035q02_mode);
150 if (!mode)
151 return -ENOMEM;
152
153 drm_mode_set_name(mode);
154 drm_mode_probed_add(connector, mode);
155
156 connector->display_info.width_mm = lb035q02_mode.width_mm;
157 connector->display_info.height_mm = lb035q02_mode.height_mm;
158
159
160
161
162
163
164 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
165 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
166 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
167
168 return 1;
169 }
170
171 static const struct drm_panel_funcs lb035q02_funcs = {
172 .disable = lb035q02_disable,
173 .enable = lb035q02_enable,
174 .get_modes = lb035q02_get_modes,
175 };
176
177 static int lb035q02_probe(struct spi_device *spi)
178 {
179 struct lb035q02_device *lcd;
180 int ret;
181
182 lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
183 if (!lcd)
184 return -ENOMEM;
185
186 spi_set_drvdata(spi, lcd);
187 lcd->spi = spi;
188
189 lcd->enable_gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
190 if (IS_ERR(lcd->enable_gpio)) {
191 dev_err(&spi->dev, "failed to parse enable gpio\n");
192 return PTR_ERR(lcd->enable_gpio);
193 }
194
195 ret = lb035q02_init(lcd);
196 if (ret < 0)
197 return ret;
198
199 drm_panel_init(&lcd->panel);
200 lcd->panel.dev = &lcd->spi->dev;
201 lcd->panel.funcs = &lb035q02_funcs;
202
203 return drm_panel_add(&lcd->panel);
204 }
205
206 static int lb035q02_remove(struct spi_device *spi)
207 {
208 struct lb035q02_device *lcd = spi_get_drvdata(spi);
209
210 drm_panel_remove(&lcd->panel);
211 drm_panel_disable(&lcd->panel);
212
213 return 0;
214 }
215
216 static const struct of_device_id lb035q02_of_match[] = {
217 { .compatible = "lgphilips,lb035q02", },
218 { },
219 };
220
221 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
222
223 static const struct spi_device_id lb035q02_ids[] = {
224 { "lb035q02", 0 },
225 { }
226 };
227
228 MODULE_DEVICE_TABLE(spi, lb035q02_ids);
229
230 static struct spi_driver lb035q02_driver = {
231 .probe = lb035q02_probe,
232 .remove = lb035q02_remove,
233 .id_table = lb035q02_ids,
234 .driver = {
235 .name = "panel-lg-lb035q02",
236 .of_match_table = lb035q02_of_match,
237 },
238 };
239
240 module_spi_driver(lb035q02_driver);
241
242 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
243 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
244 MODULE_LICENSE("GPL");